Warp stop motion for looms



Oct 1, 1929. G. H. SHUTT 1,730,018

WARP STOP MOTION FOR LOOMS Filed March 26. 1927 Patented Get. 1, 1929UtT E T tFt GEC'RGE H. SHUTT, OF NEV BEDFORD, MASSACHUSETTS, ASSIGNOR TOCROMETON & KNGWLES LOOM VIORKS, OF WORCESTER, MASSACHUSETTS, ACORPORATION OF IMASSACHUSETTS WAR]? STGP MOTION FOR LOOIVIS Applicationfiled March 26,

This invention relates to improvements in means for stopping the loomshould two or more warp threads be stuck together as they approach thelease rod.

In weaving the warp is usually wound on a beam rotatably supported atthe rear of the loom and extends upwardly over guides for directing thewarp toward the harnesses where they are separated for the laying of theweft. In certain classes of warps it is necessary to provide some meansfor separating adjacent warp threads, as they are found to sticktogether from various causes, such as the sizing used on cotton warps orattractions due to static electricity resulting from the movement of theharnesses. If the warp threads stick together tightly the lease rod willordinarily break the threads and reliance must be had upon the warp stopmotion to prevent the weaving of imperfect cloth. It is an importantobject of my present invention to provide a light rod normally heldtoward the beam and movable toward the harnesses when engaged by a groupof matted warp threads to effect loom stoppage through the warp stopmotion.

It is a further object of my invention to combine a light rod with awarp stop motion in such a way that an ordinary drop wire may beemployed to stop the loom through the slackness of flexible connectionsbetween a fixed art of the loom and the rod.

With these and other objects which will appear as the descriptionproceeds, my invention relates to the arrangements and combinations ofparts hereinafter set forth, and more particularly pointed out in theclaims.

In the accompanying drawings, wherein a convenient embodiment of myinvention is shown:

Fig. 1 is a central vertical transverse section through a loom having myinvention ap plied thereto,

Fig. 2 isv a fragmentary top plan view of a 59 Fig. 4 is a view similarto Fig. 3 but with portion of a loom taken in the direction of 1927.Serial No. 178,770.

the stop rod moved forwardly by improper sticking of adjacent warpthreads and with the warp stop motion moved to effect stoppage of'theloom, and

Fig. 5 is an enlarged detail vertical section on line 55 of Fig. 2showing how a group of warp threads act to move the stop rod.

Referring to the drawings the loom frame 10 supports a warp beam 11advance movement of which may be resisted by a weight to lever 12 and afriction band 13 trained around a drum 14 and anchored to a fixed pointas at 15. The warp W which is wound on the beam may be led upwardly andover a whip roll 16 and then forwardly to the bar ness mechanism, notshown, at which point the warps are separated to form the various sheds.

The loom is provided with a warp stop motion and for the sake ofillustrationT have set forth'a motion of the type shown in patent toRegan No. 1,365,112 but any other form of warp stop motion may be used.The bottom shaft 20 has secured thereto a cam 21 which cooperates with acam lever 22 pivoted 7 to the loom frame as at 23 and attached at therear end thereof to an upwardly extending rod 24. Said rod is connectedto a lever 25 which at the time of warp fault will be operativelyconnected to a forwardly extending push rod 26. The latter is connectedto a shipper lever 27 and brake lever 28 and is effective when movedforwardly to throw the power off the loom and to apply the brake, if theloom be provided with a brake. The warp stop motion includesnon-circular oscillating detector bars 29, two being shown' in thedrawings, and said bars oscillate about their axes when the lever 25 isrocked. A

set of drop wires 30 is provided for each of terruption but when anydrop wire falls due to breakage or slackness of the corresponding warpthread oscillation of the associated bar will be prevented and at such atime the forwardly extending rod 26 will be moved to stop the loom.Fixed relatively heavy sep- 10a arator bars 31 are provided to assist inpreventing angular movement of the drop wires when the latter falls intocontact with the bars 29. F or a further understanding of theconnections between the rods 24 and 26 and the means for oscillating thedetector bars 29, reference may be had to Patent No. 1,360,638 toHolmes. The warp stop motion set forth herein is merely illustrative andit is to be understood that any form of motion for stopping the loom atwarp fault may be employed.

It is common practice when weaving certain classes of goods to employso-called lease rods which separate the warp threads, alternate threadspassing over the bar and the intervening or intermediate threads passingunder the bar. The purpose of this construction is to separate adjacentthreads so they may pass freely to their respective heddles or otherharness connect-ions. A lease rod 35 is shown in the drawings as locatedbetween the lease rod and the warp stop motion. Straps 36, one of whichis shown in the drawings, are provided to limit forward movement of thelease rod. The matter thus far described is old and forms no part of mypresent invention.

In carrying my improvement into effect I provide a light rod 40 andlocate the same between the whip roll and lease rod and also between theseparated planes of warp threads. Said rod may be made ofany suitablematerial, as iron or wood, and is held in rearward position by cords andweights 41 and 42 respectively, one set of these elements being shown inthe drawings. Rear-ward movement of the rod 40 is limited by light cords43 which are attached to said rod and extend forwardly and are securedto the forward separator bar 31, only one of said cords 43 being shownin the drawings. I further employ an auxiliary detector or drop wire 44formed substantially as shown in Fig. 3 or similar to the wires used forthe warp stop motion proper. The auxiliary drop wire straddles the cord43 to be held clear of the corresponding detector bar 29 under normalconditions. Said cord 48 may be somewhat stronger than the ordinary warpthreads so as to be able to support the weights 42, but it will besufliciently flexible to permit the auxiliary drop wire 44 to drop whensaid cord is slack.

Under normal operation the warp WV will.

move forwardly from the beam over the whip roll toward the lease rod andwill be sepa rated by the latter so as to be free to pass'to the heddlesor harness mechanism. The bottom shaft will cause reciprocation of rod24 and consequent oscillation of detector bars 29. The weights 42 willhold the stop rod 40 rearwardly in the position shown in Fi 8 so thatthecords 43 will support each drop wire 44. When a group of warp threadswhich are stuck together so tightly as not to be readily separatedreaches the stop rod 40, they will move the latter forwardly to causeslackness of one or the other of the cords 43 as indicated in Fig. 5.One of the drop wires 44 or both of them, will thereupon fall to arrestoscillation of the associated detector bar 29, as shown in Fig. 4, andthe forwardly extending rod 26 will be given a loom stop: ping movementas set forth in the aforesaid patent to Holmes. In this way the weavercan separate the warp threads which are clinging together and thusprevent their breakage. I have found from actual experience that anumber of looms equipped with the device such as set forth hereinoperate satisfactorily to stop the loom when warp threads are notproperly separated by the lease rods. If one auxiliary drop wire 44 isfound to be too light, two or more may be used until sufficient weightis resting on the cord 43.

From the foregoing it will be seen that I have provided a very simplemeans for step ping the loom when several warp threads stick togetherand resist the separating action of the lease rod, and it will furtherbe seen that this result is achieved through the use of ordinary dropwires such as form part of the ordinary equipment of a warp stop motion,the device acting upon slackness of the cords 43 to permit the drop wireto fall and thus stop the loom.

Having thus described my invention it will be apparent that changes andmodifications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention, and I do not wishto be limited to the details herein disclosed, but what I claim is:

1. In stopping mechanism for looms, a warp stop motion including spacedsubstantially horizontally aligned parallel separator bars extendingacross the loom, an oscillating de tector rod forming part of the warpstop motion, a stop rodlocated between the warp threads to be engagedand moved forwardly by a group of threads improperly connected together,a flexible element secured to one of the separator bars and extendingrearwardly and connected to the stop rod, weighted means to hold theflexible elementtaut and the stop rod in normal position, and a dropwire having a slot supported by the flexible element, said drop wire tomove into stopping relationship with the detector rod when the elementbecomes slack due to forward movement of the stop rod, said weightedmeans being supported by one of the separator bars through the flexibleelement independently of the drop wire, said detector rod extendingthrougha slot in thedrop wire.

2. In stopping mechanism for looms, a warp stop motion including spacedsubstantially horizontally aligned parallel separator bars extendingacross the loom, an oscillating detector rod forming part of the warpstop motion, a stop rod located between the warp threads to be engagedand moved forwardly by a group of threads improperly connected together,a flexible element secured to one of the separator bars and extendingrearwardly and connected to the stop rod, weighted means to hold theflexible element taut and the stop rod in normal position, and a dropwire having a slot supported by the flexible element, said drop wire tomove into stopping relationship with the detector rod when the elementbecomes. slack due to forward movement of the stop rod, said weightedmeans being supported by one of the separator bars through the flexibleelement independently of the drop wire and said detector rod extendingthrough a slot in the drop wire.

3. In a stopping mechanism for looms having a warp stop motion, a whiproll, a lease rod to separate the warp into two planes and being heldfrom movement toward the warp stop motion and mounted intermediate thewarp stop motion and the whip roll, a supply of Warp passing over thewhip roll and toward the warp stop motion, a normally stationary butmovable auxiliary rod lying between the planes of warp and independentof the lease rod, a flexible device having one end held to a fixed partof the loom, said device being attached to the auxiliary rod, means tohold the device taut under normal conditions and a second means to stopthe loom when the auxiliary rod is moved with respect to the warp stopmotion by a group of connected warp threads.

4:. In a stopping mechanism for a loom having a warp stop motion, a whiproll, a supply of warp passing over the whip roll and toward the warpstop motion, a lease rod held from movement toward the stop motion andseparating the warp threads into two planes, an element located betweenthe planes of the warp threads and capable of moving toward the warpstop motion, a flexible device having one end fixed to a stationary partof the loom, said device being connected to the element, yielding meansto hold the device normally taut, and means to stop the loom when theelement is moved toward the warp stop motion, said element beingindependent of the lease rod and moving between the planes of warp whenengaged by improperly separated warp threads.

In testimony whereof I have hereunto affixed my signature.

GEORGE H. SHUTT.

